How Much Electricity Does a Robot Mower Use? Easy 2026 Guide

8 min read by Megan Hartley Updated November 11, 2026

How much electricity does a robot mower use? About 5 to 13 kWh a month at maximum use, based on Husqvarna’s published figures for two models. At the U.S. average residential rate of 18.16 cents per kWh, that comes to roughly $11 to $28 a year. Your own bill depends on lawn size, run time and the charger, so the answer to how much electricity does a robot mower use is never one number for every yard.

The short answer

Small model: the Husqvarna Automower 305 (600 m² working area) lists 5 kWh per month at maximum use.
Larger model: the Automower 410XE NERA (1,000 m²) lists 13 kWh per month.
Yearly cost: about $11 to $28 if a mower ran at that rate for 12 months, at 18.16 cents per kWh. That is the dollar answer to how much electricity does a robot mower use.
Your number: scale the spec-sheet figure to your lawn size and run time, then multiply by your rate.

What the monthly kWh figure on a spec sheet means

The monthly kWh figure is a manufacturer estimate of how much energy a mower needs in a month of maximum use, and it is the most direct number for comparing models. To answer the question how much electricity does a robot mower use, start with this figure. Husqvarna’s Automower 305 page labels it “mean energy consumption per month at maximum use” and lists it as 5 kWh.

The page does not explain how the figure was measured, so treat it as a rated estimate rather than a metered reading. Battery capacity appears on the same spec sheet, but a bigger battery alone does not tell you how much energy a month of mowing uses. For the battery side on its own, see our guide to how long robot mower batteries last. Our reading is that the monthly figure is the number to compare.

Three robot lawn mowers lined up on a wooden workbench to compare models and how much electricity a robot mower uses — Comparing mower models side by side is the first step before reading their specs.

Two published figures side by side

The Automower 305 and the 410XE NERA differ on every spec we read, and the larger model’s monthly figure is 2.6 times the smaller one. Both numbers come from Husqvarna’s own pages. Put side by side, the answer to how much electricity does a robot mower use clearly depends on the model.

Specification	Automower 305	Automower 410XE NERA
Battery capacity	2.1 Ah	5 Ah
Charging current	1.3 A	2.2 A
Typical charging time	60 min	90 min
Working area capacity (±20)	600 m²	1,000 m²
Mean energy use per month at maximum use	5 kWh	13 kWh

The 410XE NERA has a bigger battery, charges more slowly and covers 1,000 m² against 600 m². The page gives a tolerance of plus or minus 20 on the working area, so a rated size is an approximate figure rather than a hard limit. Our explainer on robot mower coverage ratings covers how to read that number.

Area alone does not settle the monthly figure, though. Husqvarna’s New Zealand page for the Automower 305E NERA lists the same 600 m² working area as the 305, but with a 2 Ah battery, a 2.2 A charging current, a 40 min typical charging time and 7 kWh per month at maximum use. That is 2 kWh more than the UK page for the 305 gives for a nominally identical area. Our reading is that the monthly figure depends on more than rated area, but the pages do not say which other factors account for the difference.

How much electricity does a robot mower use each year

A mower at maximum use costs about $11 to $28 a year, calculated as monthly kWh times 12 times your electricity rate.

The formula is simple: monthly kWh × 12 × price per kWh, and it turns how much electricity does a robot mower use into a dollar figure. The Energy Information Administration’s monthly table gives a preliminary U.S. residential average of 18.16 cents per kWh for August 2026, up from 17.57 cents a year earlier. The all-sectors average for the same month is 14.87 cents per kWh, as of 2026-11-09.

Person measuring a robot lawn mower body with digital calipers on a workbench — Checking a mower's physical size with a caliper and notes.

Model	Monthly kWh	Yearly kWh	Yearly cost at 18.16 cents
Automower 305	5	60	about $10.90
Automower 410XE NERA	13	156	about $28.33

For a quick check on how much electricity does a robot mower use per day, spread over a 30-day month the 305’s figure works out to about 0.17 kWh a day and the 410XE NERA’s to about 0.43 kWh a day. These totals assume maximum use for all 12 months. A smaller lawn or fewer mowing months lowers the bill, so we treat the full-year number as a planning ceiling rather than a forecast. To see how running costs stack up against a gas mower, read robot mower vs gas mower long-term cost. Rates differ by state and utility, so use the price per kWh on your own bill.

Why the wall bill can be higher than the battery figure

The kWh figure describes what the mower uses, while the electricity drawn from the wall is somewhat higher because charging is never perfectly efficient. Charging losses are one reason the answer to how much electricity does a robot mower use can differ from the spec sheet. Our reading is that the outlet figure runs above the battery figure, but the sources we read give no loss percentage for either model.

The charging station and the mower’s electronics may also draw a little power when idle, and the robot mower charging station power requirements are worth checking before you plug one in. That draw is not part of the monthly figures on the spec sheets we read, so a month of real use can come out somewhat higher than the rated number, and the answer to how much electricity does a robot mower use may land above the spec.

Heads up

Neither Husqvarna page gives a standby or charger-loss number, so the gap between the rated figure and a meter reading cannot be quantified from these sources. A meter reading is the only way to close that gap.

How to estimate your own mower’s usage

Checking how much electricity does a robot mower use in your own yard takes a few steps. You can estimate your own use from the spec-sheet figure, your lawn area and your run time, then check the result with a plug-in energy meter.

Find the monthly figure. Take the kWh number from the spec sheet for your exact model, not a similar one, because it is the starting point for how much electricity does a robot mower use in your yard. Our guide to how to read a robot mower spec sheet explains the other lines.
Compare your lawn with the rated area. The rated figure is labelled maximum use, so a smaller lawn should use less energy (our reading).
Scale to your run time. If the mower works fewer hours or fewer months, reduce the monthly figure in proportion (our reading, not a manufacturer rule).
Multiply by your rate. Use the price per kWh on your electricity bill, not the national average.
Measure if you need certainty. A plug-in energy meter on the charger outlet records real use over a full month.

What the figures leave out

The monthly figures apply to the named models at maximum use, and the spec pages we read do not describe how they were measured. Remember that the question how much electricity does a robot mower use has a model-specific answer.

Test conditions. The pages give no grass, slope or weather conditions behind the 5 and 13 kWh figures.
Local rates. The EIA figure is a national average, so how much electricity does a robot mower use in your town depends on your state or utility rate.
Terrain and weather. Slopes, wet grass and frequent turns can lengthen run time. That is our reading, and the spec pages do not quantify it.
Other brands. These numbers apply only to the two Husqvarna models named here, so how much electricity does a robot mower use from another brand needs that brand’s own spec sheet.

Frequently asked questions

How much electricity does a robot mower use per day?

Based on the Automower 305’s 5 kWh monthly figure, a mower uses about 0.17 kWh a day, averaged over 30 days. The 410XE NERA’s 13 kWh a month averages about 0.43 kWh a day. These are averages across a month at maximum use, not measured daily totals.

Does a robot mower cost much to run per year?

On these figures, not much. At 18.16 cents per kWh, the two Husqvarna models come to about $11 to $28 a year if a mower ran at maximum use for all 12 months. A smaller lawn or fewer mowing months lowers that figure.

Is battery size a good guide to electricity use?

Not on its own. The 305E NERA has a 2 Ah battery and a 7 kWh monthly figure, while the 305 has 2.1 Ah and 5 kWh, so battery size and the monthly figure do not move together. Compare the monthly kWh figure directly.

Can I measure how much electricity does a robot mower use at home?

A plug-in energy meter on the charger outlet is the most direct method. Record readings over several weeks of normal mowing, then scale the total to a month. The result reflects your own lawn and schedule, not the manufacturer’s maximum-use estimate.

Sources

Automower 305 (Husqvarna): battery 2.1 Ah, 600 m² working area, 5 kWh mean energy use per month at maximum use.
Automower 305E NERA (Husqvarna, New Zealand page): battery 2 Ah, 2.2 A charging current, 40 min charging, 600 m² working area, 7 kWh per month at maximum use.
Automower 410XE NERA (Husqvarna): battery 5 Ah, 1,000 m² working area, 13 kWh per month at maximum use.
Electric Power Monthly, Table 5.6.A (U.S. Energy Information Administration): average retail price for the residential sector, 18.16 cents per kWh for August 2026 (preliminary).

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